configury: make build Reproducible

If defined, use SOURCE_DATE_EPOCH environment variable; make the build
Reproducible by forcing timestamps.  See
https://reproducible-builds.org/docs/source-date-epoch/ for more
information.

Thanks Bernhard M. Wiedemann for bringing this to our attention.

Fixes open-mpi/ompi#3759

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

README

@@ -197,12 +197,16 @@ General notes
 
 - Open MPI has taken some steps towards Reproducible Builds
   (https://reproducible-builds.org/).  Specifically, Open MPI's
-  "configure" and "make" process, by default, records some
+  "configure" and "make" process, by default, records the build date
-  system-specific information such as the hostname where Open MPI was
+  and some system-specific information such as the hostname where Open
-  built and the username who built it.  If you desire a Reproducible
+  MPI was built and the username who built it.  If you desire a
-  Build, set the $USER and $HOSTNAME environment variables before
+  Reproducible Build, set the $SOURCE_DATE_EPOCH, $USER and $HOSTNAME
-  invoking "configure" and "make", and Open MPI will use those values
+  environment variables before invoking "configure" and "make", and
-  instead of invoking "whoami" and/or "hostname", respectively.
+  Open MPI will use those values instead of invoking "whoami" and/or
+  "hostname", respectively.  See
+  https://reproducible-builds.org/docs/source-date-epoch/ for
+  information on the expected format and content of the
+  $SOURCE_DATE_EPOCH variable.
 
 Platform Notes
 --------------

autogen.pl

@@ -1209,7 +1209,7 @@ $dnl_line
 dnl This file is automatically created by autogen.pl; it should not
 dnl be edited by hand!!
 dnl
-dnl Generated by $username at " . localtime(time) . "
+dnl Generated by $username at " . localtime($ENV{SOURCE_DATE_EPOCH} || time) . "
 dnl on $full_hostname.
 $dnl_line\n\n";
 

config/getdate.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+#
+# Copyright (c) 2017      Research Organization for Information Science
+#                         and Technology (RIST). All rights reserved.
+# Copyright (c) 2020      Cisco Systems, Inc.  All rights reserved.
+
+# Provide a way to override build date for reproducible build results
+# See https://reproducible-builds.org/ for why this is good.
+
+date --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" "$@"

config/opal_functions.m4

@@ -96,7 +96,7 @@ EOF
 
 OPAL_CONFIGURE_USER="${USER:-`whoami`}"
 OPAL_CONFIGURE_HOST="${HOSTNAME:-`(hostname || uname -n) 2> /dev/null | sed 1q`}"
-OPAL_CONFIGURE_DATE="`date`"
+OPAL_CONFIGURE_DATE="`$srcdir/config/getdate.sh`"
 
 OPAL_LIBNL_SANITY_INIT
 

config/opal_get_version.m4

@@ -10,7 +10,7 @@ dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 dnl                         University of Stuttgart.  All rights reserved.
 dnl Copyright (c) 2004-2005 The Regents of the University of California.
 dnl                         All rights reserved.
-dnl Copyright (c) 2008-2014 Cisco Systems, Inc.  All rights reserved.
+dnl Copyright (c) 2008-2020 Cisco Systems, Inc.  All rights reserved.
 dnl Copyright (c) 2014      Intel, Inc. All rights reserved.
 dnl Copyright (c) 2014      Research Organization for Information Science
 dnl                         and Technology (RIST). All rights reserved.
@@ -91,7 +91,7 @@ m4_define([OPAL_GET_VERSION],[
                     $2_REPO_REV=`git describe --tags --always`
                 fi
             else
-                $2_REPO_REV="date`date '+%Y-%m-%d'`"
+                $2_REPO_REV=date`$srcdir/getdate.sh '+%Y-%m-%d'`
             fi
         fi
 

ompi/tools/mpisync/Makefile.am

@@ -34,7 +34,7 @@ AM_CFLAGS = \
             -DOPAL_CONFIGURE_DATE="\"@OPAL_CONFIGURE_DATE@\"" \
             -DOMPI_BUILD_USER="\"$$USER\"" \
             -DOMPI_BUILD_HOST="\"`(hostname || uname -n) | sed 1q`\"" \
-            -DOMPI_BUILD_DATE="\"`date`\"" \
+            -DOMPI_BUILD_DATE="\"`$(top_srcdir)/config/getdate.sh`\"" \
             -DOMPI_BUILD_CFLAGS="\"@CFLAGS@\"" \
             -DOMPI_BUILD_CPPFLAGS="\"@CPPFLAGS@\"" \
             -DOMPI_BUILD_CXXFLAGS="\"@CXXFLAGS@\"" \

ompi/tools/ompi_info/Makefile.am

@@ -30,7 +30,7 @@ AM_CFLAGS = \
             -DOPAL_CONFIGURE_DATE="\"@OPAL_CONFIGURE_DATE@\"" \
             -DOMPI_BUILD_USER="\"$$USER\"" \
             -DOMPI_BUILD_HOST="\"$${HOSTNAME:-`(hostname || uname -n) 2> /dev/null | sed 1q`}\"" \
-            -DOMPI_BUILD_DATE="\"`date`\"" \
+            -DOMPI_BUILD_DATE="\"`$(top_srcdir)/config/getdate.sh`\"" \
             -DOMPI_BUILD_CFLAGS="\"@CFLAGS@\"" \
             -DOMPI_BUILD_CPPFLAGS="\"@CPPFLAGS@\"" \
             -DOMPI_BUILD_CXXFLAGS="\"@CXXFLAGS@\"" \

oshmem/tools/oshmem_info/Makefile.am

@@ -19,7 +19,7 @@ AM_CPPFLAGS = \
             -DOPAL_CONFIGURE_DATE="\"@OPAL_CONFIGURE_DATE@\"" \
             -DOMPI_BUILD_USER="\"$$USER\"" \
             -DOMPI_BUILD_HOST="\"$${HOSTNAME:-`(hostname || uname -n) 2> /dev/null | sed 1q`}\"" \
-            -DOMPI_BUILD_DATE="\"`date`\"" \
+            -DOMPI_BUILD_DATE="\"`$(top_srcdir)/config/getdate.sh`\"" \
             -DOMPI_BUILD_CFLAGS="\"@CFLAGS@\"" \
             -DOMPI_BUILD_CPPFLAGS="\"@CPPFLAGS@\"" \
             -DOMPI_BUILD_CXXFLAGS="\"@CXXFLAGS@\"" \